REVIVE!I've recently come across some information that may explain part of the Nus' appearance, namely, their mane:
Take a look at the mane of the Nu; I have reason to believe that this is representative of the wildebeest in Africa.
Take a look at the wildebeests' mane; notice the shag, yet some how defined mane. Save the green color, similarities arise. This may be only coincidence, but bare with me and read the excerpt I found in A Spanish to English dictionary.
ņu (m)
n. wildebeest, gnu, African wild animal
This definition seems to solidify my hypothesis and give it some credence. I'll leave the rest up to further discussion. Other than the mane, they sorta look like an eggplant.(Symbolizing fruit of the planet/Entity or the Time Egg, maybe...
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Quick aside:
The behavior of Nu can be explained by the interjection form of nu:
Moments of impatience and curiosity:
nu
interj. well? so? (expression of impatience or curiosity)
Quick aside(2):
I believe it was previously mentioned that Nu(as in the Greek letter v) represents, in the wave equation, the speed of a wave. Adding to this, an importation from Xenogears that the 'Entity' in that game was a waveform existence(I bring this into the discussion due to the already innumerable connections between the games.). Perhaps the Nu-v relationship could be applied to the relationship between the Nu and the Entity.